Here is the full list of all 38 OVERPASS™ achievements.
Finish a race and sustain less than 10% damage
Install a vehicle upgrade
Collect all other achievements
Qualify for the World Finals
Win the World Finals
Win your first Challenge
Win 3 challenges in a row in Career mode
Earn your first reputation title
Earn the highest reputation title
Unlock everything in Career mode
Own everything in Career mode
Win a duel
Repair your vehicles for a total cost of $20000
Spend time repairing a vehicle yourself
Win your first obstacle course in Career mode
Win your first hillclimb in Career mode
Play a race in each venue
Win your first Gold medal on a track
Win a Gold medal on all tracks in Northern Forest
Win a Gold medal on all tracks in Open Arena
Win a Gold medal on all tracks in Adriatic Coast
Win a Gold medal on all tracks in Old Canyon
Win a Gold medal on all tracks in Jungle Ridge
Win a Gold medal on all tracks in The Pit
Win a Gold medal on all tracks
Finish a split screen race
Finish a hot seat race
Finish an online race
Buy your first vehicle in Career mode
Unlock all vehicles in Career mode
Own all vehicles in Career mode
Change the livery of a vehicle in Career mode
Own all liveries in Career mode
Install an upgrade of each type for a vehicle
Install an upgrade of each type for all vehicles
Finish an obstacle course without any penalties
Unlock all rider gear in Career mode
Own all rider gear in Career mode